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The social-network company says apps may have had improper access to photos

A look at documents released by a U.K. lawmaker as part of a British parliamentary committee inquiry into “disinformation and fake news,” reveals how Facebook and CEO Mark Zuckerberg gave select developers special access to user data and deliberated on whether to sell that data. (Photo: Getty Images)

Facebook Inc. said pictures belonging to up to 6.8 million users may have been exposed by a software glitch that granted app developers access to the photos, the latest in a series of privacy lapses at the social-media giant.

Up to 1,500 apps may have had improper access to photos that weren’t yet shared by Facebook users, including in draft posts, from Sept. 13 to Sept. 25, the company said Friday in a post on its developers’ blog.